Combination brace and bit drill



Dec. 2, 1930. w. c. HAMILTON COMBINATION BRACE AND BIT DRILL Filed Dec. 2 Sheets-Sheet l Dec. 2, 1930.

W. C. HAMILTON COMBINATION BRACE AND BIT DRILL Filed Dec. 21, 1926 2 Sheets-Sheet awake a Patented Dec.

. i wanna HAMILTON,- F vrcnsnnne, ussrssirrr i p fqonnmh'rronnniion'rinn nrrnnrrrjjf' im utation filedbecember 2, 1, 1926. Serial 1 No. isai'vaf i invention relates to pertains particularly, to, a "bit. brace designed to be converted to a handy or power drill.

be converted for use as a-han'd operateddrill, or adaptedto have ja power cable attached.

thereto; to set up apower drill.

' Still another object of this lnvention is: to provide in a manner as hereinafter set forth, the combinationwith a bit brace, of means for attaching anljautomaticfeed mechanism tothe chuck ofthe braceso thatthe jdevice maybe converted intoa self feeding power mechanism. Y

A still further obj ect of the invention to.

provide a combined'hand operated bit brace and power mechanism of properLbalance, d11- rable andadapted to be easily converted from one usefto'yanother and comparatively inexpensive to manufacture.

7 Numerous otherobjects and advantages of the invention will become apparent as the description proceeds, and it"will be best under:

stood from a consideration'of the following detailed description taken-in connection with the accompanying drawingspforming a part of this specification with the understanding,

however, that the invention is not confined to any strict conformity with the showing.- of the. drawings, but may be changed ormodified so longas such changes or modifications mark nomaterial departure from the salient features of the inventionas expressed in the ap pendedclaim.

In the drawings :7

bit brace in side elevation tion.

1 Figure 2is longitudinal sectional view through the chuck and the casing headgearried thereby.

taken uponthe line 44c ofFigure 2. j

' Figure 5 is a transverse section taken upon the line 5,5 of Figure 3.

Figure 3 is an enlarged sectionalview taken l upon the line 33 of Figure 2.

Figure 4; is an enlarged transverse section V Figure 6 shows the brace chuck having the the; line 9- 9. of Figure 17.

canrenoaalthasemna ash-gated.

mechanism attached thereto; preparatory to V usingthechuck as a power drilL; A primary obj ect ofthis'invention is topro-I vide, in a manner as hereinafter set forthfla bit brace so constructed that the samemaystructure'shown in Figure 6,.the-section being taken'npon: the line 7-7 of 'Figure 6. Figure 8 is ,a transverse sectiontaken upon Figure 9 isa transverseseeti nrtaken upon ber us d on ec ion i hei zmsch r.

nism for attaching a; holding' chain to the z mechanism. V c

Figure '11 is a; side elevation, of. the cap,;

- Figure l2 ;i s another side elevation of the cap showing the manner in whichthe holding chain is attached'thereto.

Referringf v ovvto the drawings detail wherein like numerals of reference indicate corresponding "parts throughout .the several views, the numeral 1 indicates -generally' the bit brace chuck,jcarrying the gear encasing; 7 head indicated generallybyth, numeral .2. v r

-tap'ered"',inner end of ajbit, as indicated in;

dottedlinesaiat 6i inFigure' 2. "It will be' readily understood that adjusting the nut 5 longitudinally of thebore A, the same can. be positioned to sizefl Threaded onto thehead 3 isa chuck sleeve 7, the outer end 8 of which. is uofgreater diameterthan the inner endand the interior diameter of jthis..outerportion 8 is further enlarged as indicated at 9 to receive. the

flanged portion 10 of the chuck jaw controlling collar 11, the-inner wall f thisportion Qbeing threaded. to receive the ring 12 sur rounds the collar 11. to obstruct-passage of the portion 10 of the. collars removal.

0011 m prevent the I o 19 makebits of largeor small The lower end edge of the head 3 is provided at diametrically opposite points with slots 13 which receive the shank of the jaw members 14, suitable pins 15 being passed through the shanks of the aws to maintain the same in position in the slots 13. The backs of the jaws 14 fit in the grooves formed in the inner face of the surrounding collar 11 which grooves converge downwardly as shown in Figure 2 and from this it will be readily understood that upon threading the sleeve 7 inwardly upon the head 3 the collar 11 will be drawn inwardly also and will cause the lower ends .of the jaws 14 to be 3 moved together, the inner faces of the jaws being serrated to assist them in shank of a bit member. 7

The gear encasing head 2 comprises a hollow body mounted upon the upper end of gripping the the head 3, the; lower wall 16 of this body being removable as shown, for access to the interior. At diametrically opposite points upon the casing side wall, sleeves 17 and 18 are formed which project from the wall and the sleeve 17 is closed at its inner end forming the socket 19, the wall of which is provided with screw threads, while' 'the sleeve 18 opens directly through to the'interior of the casing, as indicated at 20.

The outer end of the extendedsleeve 17 is provided with screw threads while at diametrically opposite points, inwardly of the screw threads, is formed in the outer face of the sleeve, grooves 21 which communicate with passages 22 leading through'the wall of the casing to the interior thereof. In each of thepa'ssages 22 is a pawl 23, the inner end of each pawl projecting to the central portion of the casing while the other end thereof has a finger-24 which extends outwardly, and normally lies in a groove 21in the adjacent sleeve. These pawls are pivotally held in position by pin members25. Surrounding the inner portion of the sleeve 17 is a pawl actuating or controlling ring 26, the inner face of which is provided with notches 27 (Figure 5) into which the pawl fingers 24 are permitted to move under certain conditions hereinafter described.

A retaining ring 28 is threaded upon the outer end of the sleeve 17 to hold the pawl controlling ring 26 in the proper position.

The sleeve extension 18 has a cap 29 threaded thereover, which cap is of greater length than the sleeve and has an aperture 30formed through the outer end thereof. When the cap 29 is threaded into position as shown in Figure 3 the face 31 is formed to receive the surrounding flange 32 of a power shaft 33, the inner end of which is slotted as indicated at 34 for engagement with the rib 35 of the stub shaft36 positioned in the inner end of the passage 20 through the sleeve body 18. This power shaft 33 is attached when the-brace struca is fixed by the pin member 39.

Within the casing 2 there is positioned a pair of meshed beveled gears 40 and 41, the

gear 40 being secured to the stub shaft 36 whilethe 'gear 41 is secured upon the vertical shaft 37. The'shaft 37 also carries above.

the gear 41, a ratchet wheel 42 with the teeth of which the pawls 23 are adapted to engage, on opposite sides thereof, in the usual manner, i

From the foregoing description it will be readily seen that by shifting the pawl controlling ring 26 so that both pawl lingers 24 might shiftinto the notches 27 of the ring, the pawls will be permitted to engage the ratchet wheel 42 and any turning movement given to the casing 2 will be imparted, through the shaft 37 to the chuck body 1. Shifting of the pawl controlling ring 36 will permit the turning of the casing in one direction to carry with it the chuck 1 while allowing the casing to idle in the opposite direction and the ring can also be shifted to permit the casing to revolve freely about the shaft 37 without turning the chuck body 1, as will be readily understood.

Mounted upon the top of the casing 2 is a nut body 43 having a stud 44 upon the under side thereof and adapted to be threaded into a threaded recess in the upper portion of the shaft 37 The top surface of this nut is provided with a threaded recess or bore for the purpose hereinafter set forth.

The usual bit brace crank is indicated generally by the numeral 45 and the arm 46 of this crank has its free end threaded for engagement in the bore 19 of the sleeve extension 17" to permit the use of the brace by hand in the usual manner. This crank arm 46 may be removed for the conversion of the tool to power use in the following manner.

The power shaft 33 isattached to the stub shaft 36 in the manner already described, and there is then employed in conjunction with the structures 1 and 2 an automatic feed mechanism indicated generally by the numeral 47, which mechanism will be hereinafter described in detail.

The feed mechanism used in connection with the structures 1 and 2 comprises a central shaft 48 having one end threaded in the recess of the nut 43 in alignment with the shaft 37 in the casing 2. A collar 49 surrounds the lower portion of the shaft 48 and is secured thereto by means of the'set screw which has projecting from the peripheri'al face thereof, a pin 51.

Surrounding the shaft/l8 is an elongated sleeve 52, threaded'throughout its length and terminatingat the lower end in the surrounding relatively broad flange 53,a portion of which is flattened as at 54, and has projecting therefrom the stud upon which is mounted a spur gear 56'. The flange 53 of the sleeve 52 is of greaterdianieter than thecolla'r 49 as shown in Figures 6 and 7 and the spur 56 is designed to engage the pin 51 or rather the pin 51 engagesbetween the teeth of the spur gear 56 whenthesleeve and the flange portion integral therewith is revolved;

The upper end of the shaft 48 is reduced and threaded as at 54fto receive anut 55 which nut retains'about the upper end of the shaft'and upon the upper end of the sleeve 52 c a pair of disc members 56 which are held in.

spaced relation by. bearing balls 5'7, the

opposed faces of WlllOlfCllSCS are grooved toset up race ways forthese balls. V

Surrounding the lower portion of; the sleeve 52 and resting upon the flange 53 is a" plate body 58hav'ing the-periphery thereof formed" to set up theteeth 59 designed to be engaged by the teeth of the'spur gear 56, at all times.

'61 is threaded to receive thereover an elongated housing body The top of this housing body is closed and is formed to provide a pointed head 63.

As is well known, powerope'rated drills" are usually provided with means for holding the same against the work and there is provided for use in connection with this drill a cap 64: designed to fit over the head of the housing 62, which cap has extending from the side thereof a lug 65, provided at; its

' underside with the slot 66 for the reception of one link of a chain body, a portion of which chain is shown and indicated by' the numeral 67. The end link of this chain is links is engaged in the s1ot69 in the manner shown; When the power shaft 33 is revolved rotary motion will be imparted to' the shaft 37 and tothechuck l andalso to the shaft 48. The collar-'49 being rotated with the shaft 48 causes the pin, each time it passes beneath'ithe spur gear 56, to slightly rotate; this gear thus imparting rotary motion to the toothed plate 58 and causing the rotation of the housing 62 through the medium of the posts60. The h0using'62 is thus Jcausedto move upwardly upon the threaded sleeve 52, againstthe cap- 64: thus forcing the entire tool downwardly against the work upon which it isoperating. v

,Having thus described my invention, what I claim is: r

In a drill, a head, a shaft rotatabl y carried by said-head, a chuck onone side ofthe head secured .to the shaft-for rotationtherewith,

means for rotating theshaft, a collar secured to the shaft on the op'positeside of the head from said chuck, a laterally projecting pin if carried the periphery of the collar, an elongated exteriorly threaded sleeve sur- "rounding and rotatably mounted upon said jshaft beyond saidhead and collar, a flange formed on the inner. end of the sleeve and Y resting upon said collar, an elongated housing inclosing said sleeve and having threaded connection therewith, a workengaging point formed on the'outer end of said housing,

said housing being 1 designed to be held againstrotary movement when the tool is in 1 use by said work engagingpoint, a disc having the periphery thereoftoothed resting upon said flange, a rigid connection between the disc and housing, a radially extending stub shaft carried bythe periphery of the disc, and a toothed gear rotatably mounted on the stub shaft and having the teeththereofnormally meshing with the teeth of said disc, said gear being disposed to have said pin contact therewith at eachrevol'ution of the shaft to rotate said sleeve.

r In testimony whereof I affix my signature.

WADE o. HAMILTON. 1

' insertedin the slot 66, and a pin is passed through the body 65 and located in the slot. h

Opposite the extension 65, an ear 6 8 is formed having a laterally opening slot 69 through the link out thereinto, in which slot another link of] the chain 67, may be engaged in the manner shown in Figure 12. When in operation, as a power drill, when the tool' is placed'in position upon the work with the cap 64: upon I the housing 62, the chain'67having one end secured in the slot 66, is passed downwardly beneath the work and brought up upon the opposite side of the tool where one of the 

